MikroElektronika PIC Microcontrollers PIC18 Manuel d'utilisateur télécharger pdf (Page 40)

node filter is set to accept identifier 500). This is a request to the COLLECTOR

node to send the temperature reading. The program then reads the temperature from

the CAN bus, converts it to a string in array txt, and displays it on the LCD. This

process repeats after a one-second delay.

COLLECTOR Program

Figure 9.18 shows the program listing of the COLLECTOR program, called

COLLECTOR.C. The initial part of this program is the same as the DISPLAY

program. The receive filter is set to 500 so that messages with identifier 500 are

accepted by the program.

Inside the program loop, the program waits until it receives a request to send the

temperature. Here the request is identified by the reception of character “T”. Once a

valid request is received, the temperature is read and converted into



C (stored in

variable temperature) and then sent to the CAN bus as a byte with an identifier value

equal to 3. This process repeats forever.

Figure 9.19 summarizes the operation of both nodes.

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MikroElektronika PIC Microcontrollers PIC18 Manuel d'utilisateur Page 40